There are several variable and bounding scenarios we need to consider:

• no spatial subsetting and no variables - return no query string in OPeNDAP URL; this will give users all variables for the entire extent defined in the variables’ metadata.
• variables but no spatial subsetting - return a query string with just the variables requested; a Latitude,Longitude will also be appended to the OPeNDAP URL; this will give users just these variables, but for the entire extent defined in each variable’s metadata.
• variables and spatial subsetting - return a query string with the variables requested as well as the subsetting requested; this will give users just these variables, with data limited to the specified spatial range.
• spatial subsetting but no variables - this is a special case that needs to do a little more work: special subsetting without variables will link to an essentially empty OPeNDAP file; as such, we need to iterate through all the variables in the metadata and create an OPeNDAP URL query string that provides the sensible default of all variables.

For each of those conditions, a different value of vars will be returned, allowing for the desired result. Respective to the bullet points above:

• vars - empty vector
• vars - metadata for all the specified variable ids
• vars - metadata for all the specified variable ids
• vars - metadata for all the variables associated in the collection

Documentation forthcoming

Documentation forthcoming

Documentation forthcoming

Documentation forthcoming

Documentation forthcoming

Documentation forthcoming

Documentation forthcoming